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Liu Y, Woerpel KA. Uncatalyzed Carbometallation Involving Group 13 Elements: Carboboration and Carboalumination of Alkenes and Alkynes. SYNTHESIS-STUTTGART 2023; 55:2261-2272. [PMID: 38249784 PMCID: PMC10795483 DOI: 10.1055/s-0042-1751362] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
Carbometallation of alkenes and alkynes are powerful carbon-carbon bond-forming reactions. The use of compounds containing bonds between carbon and group 13 elements, particularly boron and aluminum, are particularly attractive because of the versatility of subsequent transformations. Uncatalyzed carboboration and carboalumination represent less common classes of reactions. This Short Review discusses uncatalyzed carboboration and carboalumination reactions of alkenes and alkynes, including the reaction design and mechanism.
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Affiliation(s)
- Yudong Liu
- Department of Chemistry, New York University, 100 Washington Square East, New York, NY 10003 USA
| | - K A Woerpel
- Department of Chemistry, New York University, 100 Washington Square East, New York, NY 10003 USA
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2
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Federmann P, Bosse T, Wolff S, Cula B, Herwig C, Limberg C. A strained intramolecular P/Al-FLP and its reactivity toward allene. Chem Commun (Camb) 2022; 58:13451-13454. [PMID: 36342335 DOI: 10.1039/d2cc05640b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
FLPs featuring aluminum-phosphane interactions, spring-loaded by a rigid biphenylene linker, have been accessed through a route where trimethyltin units at phosphane-functionalized organic backbones are exchanged by an AlCl2 moiety. Upon contact with substrates like CO2 these are readily bound by the Al/P site with release of strain. The system could also be utilized for a unique reactivity, namely the activation of allene.
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Affiliation(s)
- Patrick Federmann
- Institut für Chemie, Humboldt-Universität zu Berlin, Brook-Taylor-Straße 2, 12489, Berlin, Germany.
| | - Tamino Bosse
- Institut für Chemie, Humboldt-Universität zu Berlin, Brook-Taylor-Straße 2, 12489, Berlin, Germany.
| | - Siad Wolff
- Institut für Chemie, Humboldt-Universität zu Berlin, Brook-Taylor-Straße 2, 12489, Berlin, Germany.
| | - Beatrice Cula
- Institut für Chemie, Humboldt-Universität zu Berlin, Brook-Taylor-Straße 2, 12489, Berlin, Germany.
| | - Christian Herwig
- Institut für Chemie, Humboldt-Universität zu Berlin, Brook-Taylor-Straße 2, 12489, Berlin, Germany.
| | - Christian Limberg
- Institut für Chemie, Humboldt-Universität zu Berlin, Brook-Taylor-Straße 2, 12489, Berlin, Germany.
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3
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Shek HL, Tam KT, Yiu SM, Tse MK, Morris RH, Wong CY. Osmium(II)-Induced Rearrangement of Allenols for Metallafuran Complexes. Organometallics 2022. [DOI: 10.1021/acs.organomet.2c00113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Hau-Lam Shek
- Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong SAR, China
| | - King-Ting Tam
- Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong SAR, China
| | - Shek-Man Yiu
- Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong SAR, China
| | - Man-Kit Tse
- Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong SAR, China
| | - Robert H. Morris
- Department of Chemistry, University of Toronto, 80 Saint George Street, Toronto, Ontario M5S 3H6, Canada
| | - Chun-Yuen Wong
- Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong SAR, China
- State Key Laboratory of Terahertz and Millimeter Waves, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong SAR, China
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4
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Averdunk A, Hasenbeck M, Müller T, Becker J, Gellrich U. 1,2-Carboboration of Arylallenes by In Situ Generated Alkenylboranes for the Synthesis of 1,4-Dienes. Chemistry 2022; 28:e202200470. [PMID: 35348257 PMCID: PMC9325554 DOI: 10.1002/chem.202200470] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2022] [Indexed: 12/26/2022]
Abstract
We herein report a novel method for the coupling of unactivated alkynes and arylallenes, which relies on an unprecedented and regioselective 1,2-carboboration of the allene by an alkenylborane. The alkenylborane is conveniently prepared in situ by hydroboration of an alkyne with Piers' borane, i. e., HB(C6 F5 )2 . The boryl-substituted 1,4-dienes that are formed by this carboboration are well-suited for a subsequent Suzuki-Miyaura coupling with aryl iodides. This allowed us to develop a three-step, one-pot protocol for the synthesis of aryl-substituted 1,4-dienes. The generality of the reaction was demonstrated by the synthesis of twenty dienes with modular variations of all three reaction partners. The mechanism of the new 1,2-carboboration was investigated using dispersion corrected double-hybrid DFT computations that allowed us to rationalize the chemo- and regioselectivity of this key step.
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Affiliation(s)
- Arthur Averdunk
- Institut für Organische ChemieJustus-Liebig-Universität GießenHeinrich-Buff-Ring 1735392GießenGermany
| | - Max Hasenbeck
- Institut für Organische ChemieJustus-Liebig-Universität GießenHeinrich-Buff-Ring 1735392GießenGermany
| | - Tizian Müller
- Institut für Organische ChemieJustus-Liebig-Universität GießenHeinrich-Buff-Ring 1735392GießenGermany
| | - Jonathan Becker
- Institut für Anorganische und Analytische ChemieJustus-Liebig-Universität GießenHeinrich-Buff-Ring 1735392GießenGermany
| | - Urs Gellrich
- Institut für Organische ChemieJustus-Liebig-Universität GießenHeinrich-Buff-Ring 1735392GießenGermany
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5
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Guerzoni MG, van Ingen Y, Melen RL. Recent applications of fluorinated arylborane derivatives. ADVANCES IN ORGANOMETALLIC CHEMISTRY 2022. [DOI: 10.1016/bs.adomc.2022.03.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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6
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Kwak S, Choi J, Han J, Lee SY. Regio- and Stereoselective Addition of Secondary Phosphine Oxides to Allenoates Catalyzed by Main-Group Lewis Pairs. ACS Catal 2021. [DOI: 10.1021/acscatal.1c04242] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Soojin Kwak
- Department of Chemistry, Yonsei University, Seoul 03722, Republic of Korea
| | - Jeongin Choi
- Department of Chemistry, Yonsei University, Seoul 03722, Republic of Korea
| | - Jimin Han
- Department of Chemistry, Yonsei University, Seoul 03722, Republic of Korea
| | - Sarah Yunmi Lee
- Department of Chemistry, Yonsei University, Seoul 03722, Republic of Korea
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7
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You C, Sakai M, Daniliuc CG, Bergander K, Yamaguchi S, Studer A. Regio‐ and Stereoselective 1,2‐Carboboration of Ynamides with Aryldichloroboranes. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202107647] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Cai You
- Organisch-Chemisches Institut Westfälische Wilhelms-Universität Corrensstrasse 40 48149 Münster Germany
| | - Mika Sakai
- Department of Chemistry Graduate School of Science and Integrated Research Consortium on Chemical Sciences (IRCCS) Nagoya University Furo, Chikusa Nagoya 464-8602 Japan
| | - Constantin G. Daniliuc
- Organisch-Chemisches Institut Westfälische Wilhelms-Universität Corrensstrasse 40 48149 Münster Germany
| | - Klaus Bergander
- Organisch-Chemisches Institut Westfälische Wilhelms-Universität Corrensstrasse 40 48149 Münster Germany
| | - Shigehiro Yamaguchi
- Department of Chemistry Graduate School of Science and Integrated Research Consortium on Chemical Sciences (IRCCS) Nagoya University Furo, Chikusa Nagoya 464-8602 Japan
- Institute of Transformative Bio-Molecules (ITbM) Nagoya University Furo, Chikusa Nagoya 464-8601 Japan
| | - Armido Studer
- Organisch-Chemisches Institut Westfälische Wilhelms-Universität Corrensstrasse 40 48149 Münster Germany
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8
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You C, Sakai M, Daniliuc CG, Bergander K, Yamaguchi S, Studer A. Regio- and Stereoselective 1,2-Carboboration of Ynamides with Aryldichloroboranes. Angew Chem Int Ed Engl 2021; 60:21697-21701. [PMID: 34310824 PMCID: PMC8518048 DOI: 10.1002/anie.202107647] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2021] [Revised: 07/23/2021] [Indexed: 12/17/2022]
Abstract
Catalyst‐free 1,2‐carboboration of ynamides is presented. Readily available aryldichloroboranes react with alkyl‐ or aryl‐substituted ynamides in high yields with complete regio‐ and stereoselectivity to valuable β‐boryl‐β‐alkyl/aryl α‐aryl substituted enamides which belong to the class of trisubstituted alkenylboronates. The 1,2‐carboboration reaction is experimentally easy to conduct, shows high functional group tolerance and broad substrate scope. Gram‐scale reactions and diverse synthetic transformations convincingly demonstrate the synthetic potential of this method. The reaction can also be used to access 1‐boraphenalenes, a class of boron‐doped polycyclic aromatic hydrocarbons.
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Affiliation(s)
- Cai You
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität, Corrensstrasse 40, 48149, Münster, Germany
| | - Mika Sakai
- Department of Chemistry, Graduate School of Science and Integrated Research Consortium on Chemical Sciences (IRCCS), Nagoya University, Furo, Chikusa, Nagoya, 464-8602, Japan
| | - Constantin G Daniliuc
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität, Corrensstrasse 40, 48149, Münster, Germany
| | - Klaus Bergander
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität, Corrensstrasse 40, 48149, Münster, Germany
| | - Shigehiro Yamaguchi
- Department of Chemistry, Graduate School of Science and Integrated Research Consortium on Chemical Sciences (IRCCS), Nagoya University, Furo, Chikusa, Nagoya, 464-8602, Japan.,Institute of Transformative Bio-Molecules (ITbM), Nagoya University, Furo, Chikusa, Nagoya, 464-8601, Japan
| | - Armido Studer
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität, Corrensstrasse 40, 48149, Münster, Germany
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9
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Affiliation(s)
- Urs Gellrich
- Institut für Organische Chemie Justus-Liebig-Universität Gießen Heinrich-Buff-Ring-17 35392 Gießen Germany
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10
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Hasenbeck M, Wech F, Averdunk A, Becker J, Gellrich U. Indene formation upon borane-induced cyclization of arylallenes, 1,1-carboboration, and retro-hydroboration. Chem Commun (Camb) 2021; 57:5518-5521. [PMID: 33955432 DOI: 10.1039/d1cc01750k] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
We herein report the reaction of arylallenes with tris(pentafluorophenyl)borane that yields pentafluorophenyl substituted indenes. The tris(pentafluorophenyl)borane induces the cyclization of the allene and transfers a pentafluorophenyl ring in the course of this reaction. A Hammett plot analysis and DFT computations indicate a 1,1-carboboration to be the C-C bond-forming step.
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Affiliation(s)
- Max Hasenbeck
- Institut für Organische Chemie, Justus-Liebig-Universität Gießen, Heinrich-Buff-Ring 17, 35392 Gießen, Germany.
| | - Felix Wech
- Institut für Organische Chemie, Justus-Liebig-Universität Gießen, Heinrich-Buff-Ring 17, 35392 Gießen, Germany.
| | - Arthur Averdunk
- Institut für Organische Chemie, Justus-Liebig-Universität Gießen, Heinrich-Buff-Ring 17, 35392 Gießen, Germany.
| | - Jonathan Becker
- Institut für Analytische und Anorganische Chemie, Justus-Liebig-Universität Gießen, Heinrich-Buff-Ring 17, Gießen 35392, Germany
| | - Urs Gellrich
- Institut für Organische Chemie, Justus-Liebig-Universität Gießen, Heinrich-Buff-Ring 17, 35392 Gießen, Germany.
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11
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Wilson DWN, Mehta M, Franco MP, McGrady JE, Goicoechea JM. Linkage Isomerism Leading to Contrasting Carboboration Chemistry: Access to Three Constitutional Isomers of a Borylated Phosphaalkene. Chemistry 2020; 26:13462-13467. [PMID: 32495945 PMCID: PMC7702093 DOI: 10.1002/chem.202002226] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Indexed: 12/03/2022]
Abstract
We describe the reactivity of two linkage isomers of a boryl-phosphaethynolate, [B]OCP and [B]PCO (where [B]=N,N'-bis(2,6-diisopropylphenyl)-2,3-dihydro-1H-1,3,2-diazaboryl), towards tris- (pentafluorophenyl)borane (BCF). These reactions afforded three constitutional isomers all of which contain a phosphaalkene core. [B]OCP reacts with BCF through a 1,2 carboboration reaction to afford a novel phosphaalkene, E-[B]O{(C6 F5 )2 B}C=P(C6 F5 ), which subsequently undergoes a rearrangement process involving migration of both the boryloxy and pentafluorophenyl substituents to afford Z-{(C6 F5 )2 B}(C6 F5 )C=PO[B]. By contrast, [B]PCO undergoes a 1,3-carboboration process accompanied by migration of the N,N'-bis(2,6-diisopropylphenyl)-2,3-dihydro-1H-1,3,2-diazaboryl to the carbon centre.
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Affiliation(s)
- Daniel W. N. Wilson
- Department of ChemistryUniversity of OxfordChemistry Research Laboratory12 Mansfield RoadOxfordOX1 3TAUK
| | - Meera Mehta
- Department of ChemistryUniversity of ManchesterOxford RoadManchesterM13 9PLUK
| | - Mauricio P. Franco
- Instituto de QuímicaUniversity of São PauloAv. Prof. Lineu Prestes, 748—Vila UniversitariaSão Paulo—SP05508-000Brazil
| | - John E. McGrady
- Department of ChemistryUniversity of OxfordChemistry Research Laboratory12 Mansfield RoadOxfordOX1 3TAUK
| | - Jose M. Goicoechea
- Department of ChemistryUniversity of OxfordChemistry Research Laboratory12 Mansfield RoadOxfordOX1 3TAUK
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12
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Leitl J, Jupp AR, Habraken ERM, Streitferdt V, Coburger P, Scott DJ, Gschwind RM, Müller C, Slootweg JC, Wolf R. A Phosphinine-Derived 1-Phospha-7-Bora-Norbornadiene: Frustrated Lewis Pair Type Activation of Triple Bonds. Chemistry 2020; 26:7788-7800. [PMID: 32052879 PMCID: PMC7383905 DOI: 10.1002/chem.202000266] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2020] [Revised: 02/12/2020] [Indexed: 02/06/2023]
Abstract
Salt metathesis of 1-methyl-2,4,6-triphenylphosphacyclohexadienyl lithium and chlorobis(pentafluorophenyl)borane affords a 1-phospha-7-bora-norbornadiene derivative 2. The C≡N triple bonds of nitriles insert into the P-B bond of 2 with concomitant C-B bond cleavage, whereas the C≡C bonds of phenylacetylenes react with 2 to form λ4 -phosphabarrelenes. Even though 2 must formally be regarded as a classical Lewis adduct, the C≡N and C≡C activation processes observed (and the mild conditions under which they occur) are reminiscent of the reactivity of frustrated Lewis pairs. Indeed, NMR and computational studies give insight into the mechanism of the reactions and reveal the labile nature of the phosphorus-boron bond in 2, which is also suggested by detailed NMR spectroscopic studies on this compound. Nitrile insertion is thus preceded by ring opening of the bicycle of 2 through P-B bond splitting with a low energy barrier. By contrast, the reaction with alkynes involves formation of a reactive zwitterionic methylphosphininium borate intermediate, which readily undergoes alkyne 1,4-addition.
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Affiliation(s)
- Julia Leitl
- Institute of Inorganic ChemistryUniversity of Regensburg93040RegensburgGermany
| | - Andrew R. Jupp
- van ‘t Hoff Institute for Molecular SciencesUniversity of AmsterdamScience Park 904, PO Box 941571090 GDAmsterdamThe Netherlands
| | - Evi R. M. Habraken
- van ‘t Hoff Institute for Molecular SciencesUniversity of AmsterdamScience Park 904, PO Box 941571090 GDAmsterdamThe Netherlands
| | - Verena Streitferdt
- Institute of Organic ChemistryUniversity of Regensburg93040RegensburgGermany
| | - Peter Coburger
- Institute of Inorganic ChemistryUniversity of Regensburg93040RegensburgGermany
| | - Daniel J. Scott
- Institute of Inorganic ChemistryUniversity of Regensburg93040RegensburgGermany
| | - Ruth M. Gschwind
- Institute of Organic ChemistryUniversity of Regensburg93040RegensburgGermany
| | - Christian Müller
- Institute of Chemistry and BiochemistryFreie Universität BerlinFabeckstr. 34/3614195BerlinGermany
| | - J. Chris Slootweg
- van ‘t Hoff Institute for Molecular SciencesUniversity of AmsterdamScience Park 904, PO Box 941571090 GDAmsterdamThe Netherlands
| | - Robert Wolf
- Institute of Inorganic ChemistryUniversity of Regensburg93040RegensburgGermany
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13
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Gazis TA, Mohajeri Thaker BAJ, Willcox D, Ould DMC, Wenz J, Rawson JM, Hill MS, Wirth T, Melen RL. 1,3-Carboboration of iodonium ylides. Chem Commun (Camb) 2020; 56:3345-3348. [DOI: 10.1039/c9cc08749d] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Herein, we disclose the utilisation of iodonium ylides to access a range of boron dienolates.
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Affiliation(s)
- Theodore A. Gazis
- Cardiff Catalysis Institute
- School of Chemistry
- Cardiff University
- Cardiff
- UK
| | | | - Darren Willcox
- Cardiff Catalysis Institute
- School of Chemistry
- Cardiff University
- Cardiff
- UK
| | - Darren M. C. Ould
- Cardiff Catalysis Institute
- School of Chemistry
- Cardiff University
- Cardiff
- UK
| | - Jan Wenz
- Cardiff Catalysis Institute
- School of Chemistry
- Cardiff University
- Cardiff
- UK
| | - Jeremy M. Rawson
- Department of Chemistry and Biochemistry
- University of Windsor
- Ontario N9B 3P4
- Canada
| | | | | | - Rebecca L. Melen
- Cardiff Catalysis Institute
- School of Chemistry
- Cardiff University
- Cardiff
- UK
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14
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Fischer M, Schmidtmann M. B(C 6F 5) 3- and HB(C 6F 5) 2-mediated transformations of isothiocyanates. Chem Commun (Camb) 2020; 56:6205-6208. [PMID: 32364554 DOI: 10.1039/d0cc02626c] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
This contribution reports on the reactivity of isothiocyanates towards the boranes B(C6F5)3 and HB(C6F5)2. The reactions of alkyl-substituted isothiocyanates with B(C6F5)3 were found to result in rearrangement reactions to yield stable thiocyanate-B(C6F5)3 adducts. Treatment of isothiocyanates with HB(C6F5)2 leads to 1,2-hydroboration and thus, B,N,C,S heterocycles are formed, which react further under non-inert conditions. Hydrolysis of the hydroboration products leads to a new access to thioformamides.
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Affiliation(s)
- Malte Fischer
- Institute of Chemistry, Carl von Ossietzky University Oldenburg, Carl von Ossietzky Straße 9-11, D-26129 Oldenburg, Germany.
| | - Marc Schmidtmann
- Institute of Chemistry, Carl von Ossietzky University Oldenburg, Carl von Ossietzky Straße 9-11, D-26129 Oldenburg, Germany.
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Li J, Daniliuc CG, Kehr G, Erker G. Borane‐Mediated Vinylphosphane Cycloaddition to Conjugated Ynones. Eur J Inorg Chem 2019. [DOI: 10.1002/ejic.201901085] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Jun Li
- Organisch‐Chemisches Institut Westfälische Wilhelms‐Universität Münster Corrensstraße 40 48149 Münster Germany
| | - Constantin G. Daniliuc
- Organisch‐Chemisches Institut Westfälische Wilhelms‐Universität Münster Corrensstraße 40 48149 Münster Germany
| | - Gerald Kehr
- Organisch‐Chemisches Institut Westfälische Wilhelms‐Universität Münster Corrensstraße 40 48149 Münster Germany
| | - Gerhard Erker
- Organisch‐Chemisches Institut Westfälische Wilhelms‐Universität Münster Corrensstraße 40 48149 Münster Germany
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16
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Sreenivasulu C, Thadathil DA, Pal S, Gedu S. A simple Lewis acid induced reaction of phenols with electrophiles: Synthesis of functionalized 4H-chromenes and ortho-benzylphenols. SYNTHETIC COMMUN 2019. [DOI: 10.1080/00397911.2019.1689268] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
| | | | - Sumit Pal
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi, India
| | - Satyanarayana Gedu
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi, India
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17
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Guru MM, De S, Dutta S, Koley D, Maji B. B(C 6F 5) 3-catalyzed dehydrogenative cyclization of N-tosylhydrazones and anilines via a Lewis adduct: a combined experimental and computational investigation. Chem Sci 2019; 10:7964-7974. [PMID: 31853352 PMCID: PMC6839809 DOI: 10.1039/c9sc02492a] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2019] [Accepted: 07/05/2019] [Indexed: 12/19/2022] Open
Abstract
Tris(pentafluorophenyl)borane-catalyzed dehydrogenative-cyclization of N-tosylhydrazones with aromatic amines has been disclosed. This metal-free catalytic protocol is compatible with a range of functional groups to provide both symmetrical and unsymmetrical 3,4,5-triaryl-1,2,4-triazoles. Mechanistic experiments and density functional theory (DFT) studies suggest an initial Lewis adduct formation of N-tosylhydrazone with B(C6F5)3 followed by sequential intermolecular amination of the borane adduct with aniline, intramolecular cyclization and frustrated Lewis pair (FLP)-catalyzed dehydrogenation for the generation of substituted 1,2,4-triazoles.
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Affiliation(s)
- Murali Mohan Guru
- Department of Chemical Sciences , Indian Institute of Science Education and Research Kolkata , Mohanpur-741246 , India . ;
| | - Sriman De
- Department of Chemical Sciences , Indian Institute of Science Education and Research Kolkata , Mohanpur-741246 , India . ;
| | - Sayan Dutta
- Department of Chemical Sciences , Indian Institute of Science Education and Research Kolkata , Mohanpur-741246 , India . ;
| | - Debasis Koley
- Department of Chemical Sciences , Indian Institute of Science Education and Research Kolkata , Mohanpur-741246 , India . ;
| | - Biplab Maji
- Department of Chemical Sciences , Indian Institute of Science Education and Research Kolkata , Mohanpur-741246 , India . ;
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18
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Adak T, Schulmeister J, Dietl MC, Rudolph M, Rominger F, Hashmi ASK. Gold-Catalyzed Highly Chemo- and Regioselective C-H Bond Functionalization of Phenols with Haloalkynes. European J Org Chem 2019. [DOI: 10.1002/ejoc.201900653] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Tapas Adak
- Organisch-Chemisches Institut; Universität Heidelberg; Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Jürgen Schulmeister
- Organisch-Chemisches Institut; Universität Heidelberg; Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Martin C. Dietl
- Organisch-Chemisches Institut; Universität Heidelberg; Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Matthias Rudolph
- Organisch-Chemisches Institut; Universität Heidelberg; Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Frank Rominger
- Organisch-Chemisches Institut; Universität Heidelberg; Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - A. Stephen K. Hashmi
- Organisch-Chemisches Institut; Universität Heidelberg; Im Neuenheimer Feld 270 69120 Heidelberg Germany
- Chemistry Department; Faculty of Science; King Abdulaziz University; 21589 Jeddah Saudi Arabia
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19
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Nguyen VD, Nguyen VT, Jin S, Dang HT, Larionov OV. Organoboron chemistry comes to light: recent advances in photoinduced synthetic approaches to organoboron compounds. Tetrahedron 2019; 75:584-602. [PMID: 31564756 PMCID: PMC6764765 DOI: 10.1016/j.tet.2018.12.040] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Photoinduced synthetic approaches to organoboron compounds have attracted significant attention in the recent years. Photochemical activation of organic molecules enables generation of reactive intermediates from a variety of precursors, resulting in borylation methods with improved and broader substrate scopes. The review summarizes recent developments in the area of photoinduced reactions of organoboron compounds with an emphasis on borylation of haloarenes, amine derivatives, and redox-active esters of carboxylic acids, as well as photoinduced rearrangements of organoboron compounds and photoinduced synthesis of organoboron compounds from alkenes and alkynes.
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Affiliation(s)
- Viet D Nguyen
- Department of Chemistry, The University of Texas at San Antonio, San Antonio, TX 78249, USA
| | - Vu T Nguyen
- Department of Chemistry, The University of Texas at San Antonio, San Antonio, TX 78249, USA
| | - Shengfei Jin
- Department of Chemistry, The University of Texas at San Antonio, San Antonio, TX 78249, USA
| | - Hang T Dang
- Department of Chemistry, The University of Texas at San Antonio, San Antonio, TX 78249, USA
| | - Oleg V Larionov
- Department of Chemistry, The University of Texas at San Antonio, San Antonio, TX 78249, USA
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20
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Min XL, Sun C, He Y. Synthesis of 1-Amino-2H-quinolizin-2-one Scaffolds by Tandem Silver Catalysis. Org Lett 2019; 21:724-728. [DOI: 10.1021/acs.orglett.8b03935] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Xiao-Long Min
- School of Chemical Engineering, Nanjing University of Science & Technology, Nanjing, 210094, China
| | - Chao Sun
- School of Chemical Engineering, Nanjing University of Science & Technology, Nanjing, 210094, China
| | - Ying He
- School of Chemical Engineering, Nanjing University of Science & Technology, Nanjing, 210094, China
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21
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Mehta M, Goicoechea JM. Carboboration of isocyanates with tris(pentafluorophenyl)borane and evidence for dissociative FLP chemistry of an acid-base pair. Chem Commun (Camb) 2019; 55:6918-6921. [PMID: 31139777 DOI: 10.1039/c9cc02707f] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
We report on the reactivity of isocyanates towards tris(pentafluorophenyl)borane which was found to result in the 1,2-carboboration of the isocyanate C[double bond, length as m-dash]O bond. The resulting six-membered heterocyclic compounds can be rationalized as adducts of imino-boranes with isocyanates and react accordingly, allowing for the dissociative displacement of the trapped isocyanate moiety in a series of exchange reactions. Related carboelementation reactions with the heavier group 13 analogues, Al(C6F5)3 and Ga(C6F5)3, result in a dimerization of the carboboration products to afford eight-membered heterocycles.
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Affiliation(s)
- Meera Mehta
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, 12 Mansfield Road, Oxford, OX1 3TA, UK.
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22
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Ueno A, Li J, Daniliuc CG, Kehr G, Erker G. Metal-Free Acetylene Coupling by the (C 6 F 5 ) 2 B-X 1,2-Halogenoboration Reaction. Chemistry 2018; 24:10044-10048. [PMID: 29722929 DOI: 10.1002/chem.201802084] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2018] [Indexed: 01/24/2023]
Abstract
(C6 F5 )2 B-halides were conveniently prepared by treatment of (C6 F5 )2 BH with tritylchloride or -bromide, respectively. With cyclopropylacetylene, (C6 F5 )2 BBr underwent sequential cis-1,2-halogenoboration followed by 1,2-carboboration to give the 4-bromo-2,4-dicyclopropylbutadienyl-B(C6 F5 )2 product. It reacted further with additional cyclopropylacetylene to give the linear triene and tetraene products in a metal-free alkyne oligomerization reaction. The pyridine adduct of the initial diene product was characterized by X-ray diffraction. (C6 F5 )2 BCl reacted analogously. Similar (C6 F5 )2 BX induced oligomerization reactions were carried out with two conjugated enynes.
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Affiliation(s)
- Atsushi Ueno
- Organisch-Chemisches Institut der Universität Münster, Westfälische Wilhelms-Universität Münster, Corrensstr. 40, 48149, Münster, Germany
| | - Jun Li
- Organisch-Chemisches Institut der Universität Münster, Westfälische Wilhelms-Universität Münster, Corrensstr. 40, 48149, Münster, Germany
| | - Constantin G Daniliuc
- Organisch-Chemisches Institut der Universität Münster, Westfälische Wilhelms-Universität Münster, Corrensstr. 40, 48149, Münster, Germany
| | - Gerald Kehr
- Organisch-Chemisches Institut der Universität Münster, Westfälische Wilhelms-Universität Münster, Corrensstr. 40, 48149, Münster, Germany
| | - Gerhard Erker
- Organisch-Chemisches Institut der Universität Münster, Westfälische Wilhelms-Universität Münster, Corrensstr. 40, 48149, Münster, Germany
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23
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Sreenivasulu C, Satyanarayana G. Zinc-Chloride-Promoted Domino Reaction of Phenols with Terminal Alkynes under Solvent-Free Conditions: An Efficient Synthesis of Chromenes. European J Org Chem 2018. [DOI: 10.1002/ejoc.201800391] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
| | - Gedu Satyanarayana
- Department of Chemistry; Indian Institute of Technology Hyderabad; 502 285 Kandi, Sangareddy Telangana India
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24
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25
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Cheng Y, Mück-Lichtenfeld C, Studer A. Transition Metal-Free 1,2-Carboboration of Unactivated Alkenes. J Am Chem Soc 2018; 140:6221-6225. [PMID: 29741375 PMCID: PMC6014685 DOI: 10.1021/jacs.8b03333] [Citation(s) in RCA: 129] [Impact Index Per Article: 21.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2018] [Indexed: 12/22/2022]
Abstract
A method for transition metal-free 1,2-carboboration of unactivated alkenes with bis(catecholato)diboron as the boron source in combination with alkyl halides as the alkyl component is introduced. The three-component reaction proceeds via a radical pathway on a broad range of unactivated alkenes, and the 1,2-carboboration products serve as valuable synthetic building blocks. Density functional theory calculations provide insights into the mechanism.
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Affiliation(s)
- Ying Cheng
- Institute of Organic Chemistry, University of Münster, Corrensstrasse 40, 48149 Münster, Germany
| | | | - Armido Studer
- Institute of Organic Chemistry, University of Münster, Corrensstrasse 40, 48149 Münster, Germany
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26
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Saptal VB, Juneja G, Bhanage BM. B(C6F5)3: a robust catalyst for the activation of CO2 and dimethylamine borane for the N-formylation reactions. NEW J CHEM 2018. [DOI: 10.1039/c8nj02816h] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this work, B(C6F5)3 is utilized as an organocatalyst for the transition-metal-free N-formylation of amines using carbon dioxide (CO2) as a C1 source and dimethylamine borane (Me2NH·BH3) as a green hydrogen transfer source at 80 °C.
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Affiliation(s)
- Vitthal B. Saptal
- Department of Chemistry
- Institute of Chemical Technology (Autonomous)
- Matunga
- Mumbai
- India
| | - Gaurav Juneja
- Department of Chemistry
- Institute of Chemical Technology (Autonomous)
- Matunga
- Mumbai
- India
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27
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Allenols versus Allenones: Rhodium-Catalyzed Regiodivergent and Tunable Allene Reactivity with Triazoles. Chemistry 2017; 23:13754-13759. [DOI: 10.1002/chem.201702468] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2017] [Indexed: 01/07/2023]
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28
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Wilkins LC, Santi N, Luk LYP, Melen RL. Reactions of biologically inspired hydride sources with B(C 6F 5) 3. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2017; 375:20170009. [PMID: 28739967 PMCID: PMC5540842 DOI: 10.1098/rsta.2017.0009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Accepted: 03/25/2017] [Indexed: 06/07/2023]
Abstract
The combination of 1-benzyl-1,4-dihydropyridines with the strong Lewis acid, B(C6F5)3, generates a stable pyridinium borohydride species in high yields (94%) in as little as 10 min. This use of biologically inspired hydride sources further builds on the recent work of new hydride donors in the formation of borohydrides. When functionalizing the dihydropyridine with an amide or carboxylic acid moiety, a disproportionation reaction composed of a series of protonation/reduction steps is observed upon the addition of B(C6F5)3 As a result, one equivalent of dihydropyridine undergoes net hydrogenation, whereas the other is dehydrogenated yielding the pyridinium counterpart in a transfer hydrogenation-type mechanism.This article is part of the themed issue 'Frustrated Lewis pair chemistry'.
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Affiliation(s)
- Lewis C Wilkins
- School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, UK
| | - Nicolò Santi
- School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, UK
| | - Louis Y P Luk
- School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, UK
| | - Rebecca L Melen
- School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, UK
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29
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Abstract
The revelation that combinations of Lewis acids and bases for which dative bonding is impeded can activate dihydrogen led to the concept of "frustrated Lewis pairs" (FLPs). Over the past decade, a range of FLP systems and substrate molecules have precipitated a paradigm change in main-group chemistry and metal-free catalysis. The FLP motif has also found application in a growing body of chemical problems in organic synthesis, transition metal and free radical chemistry, materials, enzymatic models, and surface chemistry. The current state of FLP chemistry is assessed herein, and the outlook for the future considered.
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Affiliation(s)
- Douglas W Stephan
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario M5S3H6, Canada
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30
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Field-Theodore TE, Couchman SA, Wilson DJD, Dutton JL. Carboberyllation: addition of organoberyllium species to alkenes and alkynes. A comparison with carboboration. Dalton Trans 2017; 46:7686-7692. [PMID: 28534575 DOI: 10.1039/c7dt01370a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The potential for carbometallation reactions between organoberyllium and model alkenes and alkynes has been investigated in a computational study. Results indicate that barriers for carbometallation reactions between BeR2 and alkynes are as low as 100 kJ mol-1, and much lower than corresponding reactions with MgR2. In contrast to carboboration reactions with BR3, with organoberyllium 1,2-addition is favoured over 1,1-addition. It is concluded that carbometallation reactions with beryllium are likely feasible, and that the reaction between BePh2 and alkynes provides the best opportunity for the first experimental observation of carboberyllation.
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Affiliation(s)
- Terri E Field-Theodore
- Department of Chemistry and Physics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria, Australia3086.
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31
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Lawson JR, Melen RL. Tris(pentafluorophenyl)borane and Beyond: Modern Advances in Borylation Chemistry. Inorg Chem 2017; 56:8627-8643. [DOI: 10.1021/acs.inorgchem.6b02911] [Citation(s) in RCA: 153] [Impact Index Per Article: 21.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- James R. Lawson
- School of Chemistry, Cardiff University, Main Building, Cardiff CF10 3AT, Wales
| | - Rebecca L. Melen
- School of Chemistry, Cardiff University, Main Building, Cardiff CF10 3AT, Wales
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32
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Sato K, Tan TTY, Schäfers F, Hahn FE, Stephan DW. Imidazole-stabilized, electron-deficient boron cations. Dalton Trans 2017; 46:16404-16407. [DOI: 10.1039/c7dt04030j] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Highly Lewis acidic borenium cations were prepared and are shown to activate H2 and effect 1,1-carborations of alkynes.
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Affiliation(s)
- Kaoko Sato
- Institut für Anorganische und Analytische Chemie
- Westfälische Wilhelms-Universität Münster
- D-48149 Münster
- Germany
- Department of chemistry
| | - Tristan Tsai Yuan Tan
- Institut für Anorganische und Analytische Chemie
- Westfälische Wilhelms-Universität Münster
- D-48149 Münster
- Germany
| | - Felix Schäfers
- Institut für Anorganische und Analytische Chemie
- Westfälische Wilhelms-Universität Münster
- D-48149 Münster
- Germany
| | - F. Ekkehardt Hahn
- Institut für Anorganische und Analytische Chemie
- Westfälische Wilhelms-Universität Münster
- D-48149 Münster
- Germany
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33
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Wilkins LC, Melen RL. Enantioselective Main Group Catalysis: Modern Catalysts for Organic Transformations. Coord Chem Rev 2016. [DOI: 10.1016/j.ccr.2016.07.011] [Citation(s) in RCA: 85] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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34
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Wilkins LC, Lawson JR, Wieneke P, Rominger F, Hashmi ASK, Hansmann MM, Melen RL. The Propargyl Rearrangement to Functionalised Allyl-Boron and Borocation Compounds. Chemistry 2016; 22:14618-24. [PMID: 27538742 DOI: 10.1002/chem.201602719] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2016] [Indexed: 11/08/2022]
Abstract
A diverse range of Lewis acidic alkyl, vinyl and aryl boranes and borenium compounds that are capable of new carbon-carbon bond formation through selective migratory group transfer have been synthesised. Utilising a series of heteroleptic boranes [PhB(C6 F5 )2 (1), PhCH2 CH2 B(C6 F5 )2 (2), and E-B(C6 F5 )2 (C6 F5 )C=C(I)R (R=Ph 3 a, nBu 3 b)] and borenium cations [phenylquinolatoborenium cation ([QOBPh][AlCl4 ], 4)], it has been shown that these boron-based compounds are capable of producing novel allyl- boron and boronium compounds through complex rearrangement reactions with various propargyl esters and carbamates. These reactions yield highly functionalised, synthetically useful boron substituted organic compounds with substantial molecular complexity in a one-pot reaction.
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Affiliation(s)
- Lewis C Wilkins
- School of Chemistry, Main Building, Cardiff University, Cardiff, CF10 3AT, Cymru/Wales, UK
| | - James R Lawson
- School of Chemistry, Main Building, Cardiff University, Cardiff, CF10 3AT, Cymru/Wales, UK
| | - Philipp Wieneke
- Organisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, 69120, Heidelberg, Germany
| | - Frank Rominger
- Organisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, 69120, Heidelberg, Germany
| | - A Stephen K Hashmi
- Organisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, 69120, Heidelberg, Germany.,Chemistry Department, Faculty of Science, King Abdulaziz University (KAU), Jeddah, 21589, Saudi Arabia
| | - Max M Hansmann
- Organisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, 69120, Heidelberg, Germany
| | - Rebecca L Melen
- School of Chemistry, Main Building, Cardiff University, Cardiff, CF10 3AT, Cymru/Wales, UK.
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35
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Pan F, Li XL, Chen XM, Shu C, Ruan PP, Shen CH, Lu X, Ye LW. Catalytic Ynamide Oxidation Strategy for the Preparation of α-Functionalized Amides. ACS Catal 2016. [DOI: 10.1021/acscatal.6b01599] [Citation(s) in RCA: 62] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Fei Pan
- State
Key Laboratory of Physical Chemistry of Solid Surfaces and Key Laboratory
for Chemical Biology of Fujian Province, Department of Chemistry, Xiamen University, Xiamen 361005, China
| | - Xin-Ling Li
- State
Key Laboratory of Physical Chemistry of Solid Surfaces and Key Laboratory
for Chemical Biology of Fujian Province, Department of Chemistry, Xiamen University, Xiamen 361005, China
| | - Xiu-Mei Chen
- State
Key Laboratory of Physical Chemistry of Solid Surfaces and Center
for Theoretical Chemistry, Department of Chemistry, Xiamen University, Xiamen 361005, China
| | - Chao Shu
- State
Key Laboratory of Physical Chemistry of Solid Surfaces and Key Laboratory
for Chemical Biology of Fujian Province, Department of Chemistry, Xiamen University, Xiamen 361005, China
| | - Peng-Peng Ruan
- State
Key Laboratory of Physical Chemistry of Solid Surfaces and Key Laboratory
for Chemical Biology of Fujian Province, Department of Chemistry, Xiamen University, Xiamen 361005, China
| | - Cang-Hai Shen
- State
Key Laboratory of Physical Chemistry of Solid Surfaces and Key Laboratory
for Chemical Biology of Fujian Province, Department of Chemistry, Xiamen University, Xiamen 361005, China
| | - Xin Lu
- State
Key Laboratory of Physical Chemistry of Solid Surfaces and Center
for Theoretical Chemistry, Department of Chemistry, Xiamen University, Xiamen 361005, China
| | - Long-Wu Ye
- State
Key Laboratory of Physical Chemistry of Solid Surfaces and Key Laboratory
for Chemical Biology of Fujian Province, Department of Chemistry, Xiamen University, Xiamen 361005, China
- State
Key Laboratory of Organometallic Chemistry, Shanghai Institute of
Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China
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36
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Abstract
Boranes have long been known as the archetypal Lewis acids owing to an empty p-orbital on the boron centre. Meanwhile, Lewis basic tricoordinate boranes have been developed in recent years. Here we report the synthesis of an annulated 1,4,2,5-diazadiborinine derivative featuring boron atoms that exhibit both Lewis acidic and basic properties. Experimental and computational studies confirmed that two boron atoms in this molecule are spectroscopically equivalent. Nevertheless, this molecule cleaves C-O, B-H, Si-H and P-H bonds heterolytically, and readily undergoes [4+2] cycloaddition reaction with non-activated unsaturated bonds such as C=O, C=C, C≡C and C≡N bonds. The result, thus, indicates that the indistinguishable boron atoms in 1,4,2,5-diazadiborinine act as both nucleophilic and electrophilic centres, demonstrating ambiphilic nature.
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37
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Wilkins LC, Hamilton HB, Kariuki BM, Hashmi ASK, Hansmann MM, Melen RL. Lewis acid–base 1,2-addition reactions: synthesis of pyrylium borates from en-ynoate precursors. Dalton Trans 2016; 45:5929-32. [PMID: 26435394 DOI: 10.1039/c5dt03340c] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Treatment of methyl (Z)-2-alken-4-ynoates with the strong Lewis acid tris(pentafluorophenyl) borane, B(C6F5)3, yield 2,5,6-substituted zwitterionic pyrylium borate species via an intramolecular 6-endo-dig cyclisation reaction.
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Affiliation(s)
- Lewis C. Wilkins
- School of Chemistry
- Main Building
- Cardiff University
- Cardiff CF10 3AT
- UK
| | - Hugh B. Hamilton
- School of Chemistry
- Main Building
- Cardiff University
- Cardiff CF10 3AT
- UK
| | - Benson M. Kariuki
- School of Chemistry
- Main Building
- Cardiff University
- Cardiff CF10 3AT
- UK
| | - A. Stephen K. Hashmi
- Organisch-Chemisches Institut
- Ruprecht-Karls-Universität Heidelberg
- 69120 Heidelberg
- Germany
- Chemistry Department
| | - Max M. Hansmann
- Organisch-Chemisches Institut
- Ruprecht-Karls-Universität Heidelberg
- 69120 Heidelberg
- Germany
| | - Rebecca L. Melen
- School of Chemistry
- Main Building
- Cardiff University
- Cardiff CF10 3AT
- UK
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38
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Hansmann MM, Melen RL, Rudolph M, Rominger F, Wadepohl H, Stephan DW, Hashmi ASK. Cyclopropanation/Carboboration Reactions of Enynes with B(C6F5)3. J Am Chem Soc 2015; 137:15469-77. [PMID: 26580316 DOI: 10.1021/jacs.5b09311] [Citation(s) in RCA: 73] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Stoichiometric reaction of B(C6F5)3 with 1,6-enynes is shown to proceed via initial cyclopropanation and formal 1,1-carboboration. Depending on the substitution on the alkene moiety, subsequent ring-opening of the cyclopropane affords either cyclopentane or cyclohexane derivatives in which the C6F5 and B(C6F5)2 adopt a 1,4-positioning. Mechanistically, this transformation involves π-activation of the alkyne moiety, which triggers cyclopropanation, followed by carboboration. Both the cyclopropanation and subsequent ring-opening are shown to be stereospecific. Both cyclopropanation and 1,4-carboborated products were employed as Lewis acid components in frustrated Lewis pair activation of H2 and CO2.
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Affiliation(s)
- Max M Hansmann
- Organisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg , Im Neuenheimer Feld 270, 69120 Heidelberg, Germany
| | - Rebecca L Melen
- School of Chemistry, Cardiff University , Main Building, Cardiff, CF10 3AT, Cymru/Wales, U.K
| | - Matthias Rudolph
- Organisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg , Im Neuenheimer Feld 270, 69120 Heidelberg, Germany
| | - Frank Rominger
- Organisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg , Im Neuenheimer Feld 270, 69120 Heidelberg, Germany
| | - Hubert Wadepohl
- Anorganisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg , Im Neuenheimer Feld 270, 69120 Heidelberg, Germany
| | - Douglas W Stephan
- Department of Chemistry, University of Toronto , 80 Saint George Street, Toronto, Ontario M5S 3H6, Canada
| | - A Stephen K Hashmi
- Organisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg , Im Neuenheimer Feld 270, 69120 Heidelberg, Germany.,Chemistry Department, Faculty of Science, King Abdulaziz University (KAU) , Jeddah 21589, Saudi Arabia
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